#3C3D00

CSS

:root {
  --dark-olive: #3c3d00;
  --dark-olive-rgb: 60 61 0;
  --dark-olive-oklch: oklch(0.347 0.076 110.8);
}

.element {
  color: var(--dark-olive);
  background-color: hsl(61 100% 12%);
  border-color: oklch(0.347 0.076 110.8);
}

Tailwind CSS v4

@theme {
  --color-dark-olive: #3c3d00;
  --color-dark-olive-50: #f5f8df;
  --color-dark-olive-100: #e8ebce;
  --color-dark-olive-200: #d4d8b3;
  --color-dark-olive-300: #b7bc8f;
  --color-dark-olive-400: #a0a36e;
  --color-dark-olive-500: #888b4d;
  --color-dark-olive-600: #737642;
  --color-dark-olive-700: #5c5e35;
  --color-dark-olive-800: #444524;
  --color-dark-olive-900: #2f2f18;
  --color-dark-olive-950: #1c1c09;
}

SCSS

$dark-olive: #3c3d00;
$dark-olive-rgb: 60, 61, 0;
$dark-olive-light: mix(#fff, $dark-olive, 20%);
$dark-olive-dark: mix(#000, $dark-olive, 20%);

.element {
  color: $dark-olive;
  box-shadow: 0 0 0 2px rgba($dark-olive, 0.35);
}